文件名称:battery_simulator.py
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The node publishes a floating point value on the /battery_level topic starting with
the initial_battery_level and counting down to 0 over a time period specified by
the battery_runtime parameter. Both parameters can be specified in a launch file as
the initial_battery_level and counting down to 0 over a time period specified by
the battery_runtime parameter. Both parameters can be specified in a launch file as
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battery_simulator.py